Clarilayer MCP Server

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ClariLayer is an individual-analyst context layer, delivered over MCP. Connect it to Claude Code, Cursor, or Codex and it bootstraps your real working context from the SQL and dbt you already have, reconciles your definitions against your warehouse, and remembers your corrections — so your agent stops re-explaining your data and stops making the same mistakes every session.

The problem

Every new session, your AI coding agent starts from zero about your data. So it makes the same mistakes — queries the wrong table, picks the wrong join, counts refunds in revenue, uses a churn definition you deprecated months ago. You correct it. Next session, it forgets, and you correct it again.

A hand-written CLAUDE.md of definitions helps a little — but it has the same trust problem as the original numbers: it's just asserted text. Nobody checked it against your warehouse.

What ClariLayer does

It gives your agent a durable, reconciled memory of your data context — and it lives inside the agent you already use, over MCP. Four verbs, all live:

The context you build compounds across sessions and is portable across Claude Code, Cursor, and Codex.

These four verbs are the in-flow core loop. The full contract today is 18 MCP tools at capability v32 (the four above plus propose / propose_batch, the entry and reasoning lifecycle, supersede, the read-only suggest_links, capabilities, and a health check). The canonical, live list is always discoverable by your client at connect — via the initialize response or a capabilities call — so you never have to trust a doc over the wire. See CAPABILITIES.md for what each recent capability bump added.

Install

Fastest — one command. Auto-detects Claude Code, Cursor, and Codex, writes the right config, and offers to add the standing-orders block to your CLAUDE.md:

npx clarilayer init

You'll need a free context key — sign up at clarilayer.com, then open Connect your AI to mint one. The CLI prompts for it and validates it. Full options: CLI.md.

Replace cl_YOUR_CONTEXT_KEY with your key.

Claude Code — run in your terminal:

claude mcp add --transport http clarilayer https://clarilayer.com/api/mcp/mcp --header "Authorization: Bearer cl_YOUR_CONTEXT_KEY"

Cursor — add to ~/.cursor/mcp.json:

{
  "mcpServers": {
    "clarilayer": {
      "url": "https://clarilayer.com/api/mcp/mcp",
      "headers": { "Authorization": "Bearer cl_YOUR_CONTEXT_KEY" }
    }
  }
}

Codex — add to ~/.codex/config.toml. Recent Codex connects to the URL directly, no Node/npx needed (same as Claude Code and Cursor):

[mcp_servers.clarilayer]
url = "https://clarilayer.com/api/mcp/mcp"
http_headers = { "Authorization" = "Bearer cl_YOUR_CONTEXT_KEY" }

Only on older Codex without direct-HTTP support, bridge it via mcp-remote instead — this route requires Node.js (npx):

[mcp_servers.clarilayer]
command = "npx"
args = ["-y", "mcp-remote", "https://clarilayer.com/api/mcp/mcp", "--header", "Authorization: Bearer cl_YOUR_CONTEXT_KEY"]

See QUICKSTART.md for the full walkthrough and troubleshooting.

Then tell your agent to actually use it

Paste this into your project's CLAUDE.md (or AGENTS.md) so your agent reaches for ClariLayer proactively instead of waiting to be asked. The full file is in examples/CLAUDE.md:

## ClariLayer — your data context layer (use it proactively)

ClariLayer is connected over MCP and holds this project's durable data context: definitions, schema notes, reusable SQL, assumptions, caveats, and decisions. Use it WITHOUT waiting to be asked.

- Recall first: before writing SQL, defining or computing a metric, or answering a question about this data, call `get_analysis_context` (pass a `use_case`). Build on what is already known instead of re-deriving it.
- Write back as you learn: when you establish a durable fact — a definition, schema note, reusable query (attach the SELECT as `sql`), assumption, caveat, or decision — save it with `remember`. Use `propose` for suggestions (they go to the human's review inbox).
- Reconcile on drift: if a definition's SQL changed or staleness is flagged, call `reconcile` to check it against the warehouse.
- Stay honest: treat status as `asserted`/`caveat`, never `verified`.

Propose before you save, and harvest a working session

Not every fact should write straight to your context. Two verbs put a human in the loop:

• propose stages one suggested entry in your Context Inbox. It stays pending until you accept it — it is never auto-saved and never recalled while it sits there.
• propose_batch is the bulk form: up to ~25 candidate entries in a single call, all landing in the same inbox for review.

Conversation harvest builds on propose_batch. When you explicitly ask, your agent distills the durable facts from a working conversation — the definitions, gotchas, and decisions you settled during the session — into a handful of candidates and stages them for your review. The guardrails are deliberate:

• Explicit request only — harvesting never runs in the background or ambiently; you have to ask for it.
• You approve each candidate — nothing enters your context until you accept it from the inbox.
• Your transcript is never sent to ClariLayer — only the distilled candidate facts cross the boundary, not the conversation itself.
• Harvested candidates carry provenance agent (they're the agent's suggestion, not your authorship) and remain asserted/caveat once accepted — never "verified".

propose, propose_batch, and harvest are all on the free single-player tier, alongside recall, remember, bootstrap, and reconcile.

Tidy the reasoning on an entry — reversibly

Caveats and assumptions attached to an entry have their own lifecycle, so you can quietly retire a note without losing the history:

• archive_reasoning reversibly hides an attached caveat/assumption — it stops being recalled but is kept as history.
• restore_reasoning brings an archived one back.
• forget_reasoning deletes one permanently.

(Entries themselves have the matching archive / restore / forget.)

What makes it different from a plain CLAUDE.md

reconcile. A saved definition isn't just trusted — your agent runs its SQL against your warehouse and reports the result shape back, and ClariLayer compares declared-vs-actual. A mismatch becomes a caveat so you and your agent know exactly what to trust.

On trust language — we keep it honest. Today ClariLayer's two statuses are asserted and caveat. A stronger verified status is not shipped yet — it's the documented fast-follow. We reconcile and flag caveats; we don't claim your context is "verified." (why)

Your data stays yours

ClariLayer never holds your warehouse credentials and never executes SQL server-side. Your agent is the connector — it runs queries with its own access and sends back result metadata plus any optional preview rows it chooses to include. ClariLayer stores the context, not your warehouse keys.

Pricing

Free for individuals — install, recall, remember, bootstrap, reconcile, propose / propose_batch, and conversation harvest are unmetered for single-player use. Team-merge, governance, and the Contract API are the secondary for teams expansion strand. See clarilayer.com/pricing.

Get started

1. Sign up free →
2. Open Connect your AI and mint a context key
3. Paste the install command for your agent (above)
4. In your next session, ask your agent to bootstrap from your ./sql folder — then watch the first reconcile

FAQ

Is this open source? This repo — the docs, examples, and (soon) a thin setup CLI — is MIT licensed. The ClariLayer service itself is hosted and proprietary; you connect to it with a free account. This repo is the front door, not the product source.

Where does my data go? Your context (definitions, notes, SQL you choose to save) is stored in your ClariLayer account. Your warehouse credentials are never sent to ClariLayer, and ClariLayer never runs SQL against your warehouse — your agent does that locally. See Your data stays yours.

Which agents are supported? Claude Code, Cursor, and Codex today — anything that speaks MCP over Streamable HTTP.

I have a team / need governance. That's the for teams strand — ownership, approvals, the one right metric, and the Contract API. Start here.

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